Yarn twister for spinning frames



March 25, 1952 H. M. BROWN 2,590,374

YARN TWISTER FOR SPINNING FRAMES Filed 001'.- 7, 1949 2 SHEETS-SHEET lINVENTOR. HUGH M. BROWN A TORNEY March 25, 1952 H. M. BROWN YARN TWISTERFOR SPINNING FRAMES 2 SHEETS-SHEET 2 Filed 001;. 7, 1949 FIG/7.

MW W R Flea.

ATTORNEY ing devices of my adapted for use on spinning frames, they maybe used in other machines where it is desirable closer together.

Patented Mar. 25, 1952 YARN TWISTER FOR SPINNING FRAMES Hugh M. Brown,Clemson, S. 0., assignor to Clemson Agricultural College of SouthCarolina, Clemson, S. C., a corporation of South Carolina ApplicationOctober 7, 1949, Serial No. 120,148

2 Claims.

1 This invention relates to devices for applying false twist to yarn orthread. While the twistinvention are especially to apply a real twist tothe yarn or thread passing through the machine.

A broad object of the invention is to devise a twisting device to beinserted between the front or delivery rolls of a spinning frame and thethread guides which are located directly above the spindles carrying thebobbins or quills. By such an arrangement, the necessary false twist isapplied to the yarn or thread before it reaches the thread guide, andvery little twist is applied by the traveler.

Another object of the invention is to devise a yarn twisting device inwhich the yarn is twisted-by having frictional engagement with thesurface of a single moving twister element, the frictional surface ofthe twister element being arranged to travel continuously in a closedpath which runs substantially at right angles to the yarn at'the pointof contact of the yarn with the surface. In all forms of my invention,the frictional surface of the twister element is freely exposed and isnot confined or surrounded by any other parts which would necessitatethe threading of the yarn or thread through an aperture or small spacein the twisting element.

In the use of my twister devices, the yarn is twisted near the frontrolls by rolling of the yarn from the action of the frictional surfaceof the twister element, and the traveler is left free to perform itswinding function. Since the yarn so made is completely finished after itpasses the twisting device, a heavier traveler may be used, therebypermitting winding of the bobbin with greater tension and giving agreater bobbin capacity. Another advantage of the twister of myinvention is that the balloon of the yarn under this additional tensionis so small that larger traveler rings may be placed on a given frame,or the spindles may be placed The spindles may be run at higher speedsthan usual, or finer counts may be made of shorter stable lengths thanwhen spun at usual tensions. Also, better quality yarn results from thefalse twisting immediately at the front rolls which precludes falsedraft which often takes place in this region with present machines.

In the present invention, where the twisting is done by rolling, moretwist can be placed in the yarn between the front rolls and the twist- Iing device than is finally required in the yarn.

. spinning frame are shown at I.

This is especially advantageous when making low twist yarns thatheretofore have tended to break near the front rolls.

A number of embodiments of my invention are illustrated somewhatdiagrammatically in the accompanying drawing in which Figure 1 is aperspective view of one form of twisting device in which each yarndelivered from the front rolls is twisted by engagement with theperipheral edge of a roller;

Figure 2 is a sectional view of Figure 1 taken in a vertical planepassing through the axis of the twisting roller;

Figure 3 is a sectional view similar to Figure 2 of a modified form oftwisting device in which the twisting element is a rotary disk;

Figure 4 is a front view of the twisting element of Figure 3;

Figure 5 is a sectional view similar to Figure 2 showing anothertwisting device in which the twisting element isformed of a rotary diskhaving a horizontal axis;

Figure 6 is a front view of the twisting element of Figure 5;

Figure 7 is an end view of another form of twisting device in which thetwisting element is formed of an endless belt extending throughout thelength of the spinning frame; and

Figure 8 is a view of Figure '7 taken in the direction of the arrow 8a.

Referring to Figures '1 and 2 of the drawing, one section of the frontor delivery rolls of at These rolls normally supply the yarn or thread 2to a thread guide '3 located immediately above rotating spindle l. Thethread 2 passes through the guide 3 and then through the usual traveler5 mounted upon a ring'track 6 surrounding the spindle "4, and is woundupon the bobbin carried by thespindle 4 to form the yarn package 1. Itwill be understood that relative vertical motion between the spindle 4and the track 6 is provided to properly distribute the yarn informingthe package 1.

According to my invention, a twisting device 'is inserted between thefront rolls I and the from the head end of the frame through suitby thearrow 2a.

able change-speed gearing to secure different speeds of the twisterunits for yarns of different twist. Individual twister units areprovided for each yarn or thread as shown in Figures 1 and 2, and eachtwister unit is formed of a sleeve housing 9 surrounding a portion ofthe shaft 8 which carries a worm 8a. A lateral extension 9a of thesleeve 9 encloses a gear in which meshes with and is driven by the worm811 on the shaft 8. The gear I is mounted upon shaft II which isjournaled in the housing extension 9a, and a friction roller [2 ismounted on the lower end of the shaft II. The thread guide 3 is alsosupported from the sleeve housing 9, and the entire twister unit,including the thread guide, may be tipped upwardly individually, or alltogether, for dofling the bobbins. Each unit is normally maintained inits proper operative position by means of a rearwardly extending lug 13on the sleeve 9 which engages the lower face of a stationary stop bar l4extending throughout the length of the frame. The unit housing sleeves 9together with the supporting bearings for the shaft 8 cover the entireshaft to prevent yarn from winding on the shaft .when ends come down.Also, the friction roller I2 has a circular recess in one face thereofwhich receives the cylindrical portion of the casing extension 9asurrounding the shaft II to prevent the shaft II from winding yarn orlint.

As shown in Figure 2, the friction roller I2 is mounted to rotate on anaxis inclined to the horizontal by substantially 45. The outerperipheral edge of this roller is formed of a smooth friction surfacewhich engages the thread 2 as it passes from the rolls to the guide 3.The roller I2 is so positioned with respect to the guide 3 that thethread 2 engages the roller at some point-on the top portion of theperipheral edge, and the arrangement should be such that the thread 2 isdeflected from its normal path by the roller 12, so that the tension ofthe thread will hold the thread in contact with the roller.

In the operation of the arrangement shown in Figures 1 and 2, the shaft8 will be rotated continuously in one direction to cause clockwiserotation of the rollers l2 as shown in Figure 1, and this will causeanti-clockwise twisting of the thread 2 as shown by the arrow 2a inFigure 1, and twisting of the thread in this particular location willresult in the various advantages enumerated above.

In the twisting arrangement shown in Figures 3 and i, the constructionis generally the same as that shown in Figures 1 and 2, and elementsserving the same function have been indicated by like referencenumerals. In this arrangement the twister element, instead of beingformed as a roller as in Figure 1 and 2, is

formed of a disk in mounted on the outer end of shaft I I and having arounded outer face positioned so that it engages the thread 2 at a pointnear the lower peripheral portion thereof and deflects the threadupwardly from its normal path between the rolls I and the thread guide3. Except for the fact that the shaft II is in clined at right anglestothe position shown in Figure 2, the arrangement for mounting anddriving the twister element in Figures 3 and 4 is substantially the sameas that shown in Figures 1 and 2. In this arrangement, however, the disk[2a must be rotated in an anti-clockwise direction, as shown in Figure4, to impart an anti-clockwise twist to the thread 2 as shown Thetwister disk l2a is provided with a cylindrical flange I2b on the backface thereof, and this flange surrounds the cylindrical portion of thecasing extension 9a in which the shaft II is journaled to prevent theshaft from winding yarn or lint.

The twist arrangement shown in Figures 5 and 6 is the same as thatillustrated in Figures 3 and 4 except that the shaft II for the twistingdisk 211 is arranged on a horizontal axis, and the disk [2a ispositioned so that the thread 2 engages the front face of the disk atthe upper peripheral portion thereof. With this arrangement, the disk[2a must be rotated in a clockwise direction to impart an anti-clockwisetwisting to the thread 2 as shown in Figure 6.

In Figures '7 and 8 I have illustrated a form of twisting device inwhich a single twisting element serves to twist all of the threads onone side of a spinning frame. In this arrangement the twisting elementis formed of an endless belt l5. This belt is mounted upon two mainflanged pulleys l6 and I! which are suitably journaled at opposite endsof the spinning frame, the belt 15 being arranged so that its upperreach is located somewhat above the thread guides 3 and in a position todeflect the threads 2 out of their normal path between the rolls l andthe guides 3. The upper reach of the belt 15 is supported at intervalsby idler pulleys I S which are provided with flanges to prevent shiftingof the belt by the drag from the advancing threads. The lower reach ofthe belt [5 may be suitably housed within the frame space below theidler pulleys It. In this arrangement, the thread guides 3 may bemounted to swing sidewise for doffing purposes instead of hingingupwardly as in the usual arrangement.

In the arrangement of Figures '7 and 8, the belt 15 is drivencontinuously in one direction through suitable change-speed gearingconnected to one of the pulleys IE or II. The normal tension on thethreads 2 will hold the threads in contact with the outer face of theupper reach of belt I5. With the belt moving from left to right as shownin Figure 8, the belt tends to pull the threads to the right, see Figure8, but the tension on the threads tends to pull them back to the leftthereby causing the threads to roll upon the belt and to impart twist tothe threads.

As will be seen from the foregoing, each form of my twisting deviceincludes a driven twisting element having a friction surface arranged totravel continuously in a closed path, and the friction element isarranged to engage the yarn on the underside thereof at a point wherethe fric tion surface runs substantially at right angles to thedirection of the yarn, and the twisting element is positioned to deflectthe yarn slightly upwardly from the path which it normally would followin proceeding from the delivery rolls to the thread guide. In each case,the friction surface at the point of contact with the yarn is freelyexposed, or is unconfined, so that the yarn may be arranged in operativerelation with the friction surface by simply laying the yarn across thefriction surface, and there is no necessity for threading the yarnthrough small apertures or spaces in the device. In Figures 1 to 6,inclusive, the twister element is in the form of an individual frictionwheel for each strand of yarn, whereas in Figures '7 and 8, the driventwister element is in the form of an endless band or belt arranged todrive all of the strands or threads on one side of the spinning frame.

While all forms of my yarn twisting devices illustrated and describedherein are shown as applying a counter-clockwise twist to the yarn, itwill be obvious that a twist in the reverse direction may be applied byany of the devices by simply reversing the direction of rotation of thetwister element. Also, while I prefer to arrange the driven twisterelement to engage the yarn on the underside thereof, it will be obviousthat the devices may be arranged to engage the yarn in other positions,such as on the side of the yarn, or even on the top of the yarn, but inall cases the driven twister element would engage the yarn and deflectit from its normal path of movement from the delivery rolls to thethread guide so that the normal tension of the yarn will maintain theyarn in contact with the driven twister element.

What I claim is:

1. In a textile machine in which a plurality of parallel strands of yarnare delivered each from a pair of delivery rolls to an individual threadguide spaced from said rolls, the combination of a twisting device forapplying false twist to said strands at a point between said pairs ofrolls and said thread guides, said twisting device including an endlessbelt arranged below said strands and extending transversely under eachstrand, said belt being positioned so that the outer surface of theupper reach thereof engages each strand on the underside thereof anddeflects each strand upwardly from its normal path of movement betweenits pair of'rolls and its individual thread guide, whereby each strandis held in frictional engagement with the surface of said belt by thenormal tension of the strand and false twist is applied to the strand bythe rolling of said strand over the surface of said endless belt.

2. In a spinning frame in which a plurality of strands of yarn aresupplied from delivery rolls to a plurality of thread guides spaced fromsaid rolls and located above the respective spindles of said frame, thecombination of a twisting device for applying twist to all of saidstrands at a point between said rolls and said thread guides, saiddevice including an endless belt extending throughout the length of saidframe and arranged below said strands and parallel with said rolls, saidbelt being arranged so that the upper reach thereof engages said strandson the underside thereof and deflects said strands upwardly from theirnormal paths of movement from said rolls to said thread guides, andmeans for driving said belt to impart twist to said strands.

HUGH M. BROWN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,838,682 Ingham Dec. 29, 19312,180,792 Casablancas Nov. 21, 1939 FOREIGN PATENTS Number Country Date161,971 Germany July 15, 1905 472,583 France Aug. 11, 1914

